Unidata GEMPAK Region of Interest Forecasts

View model current output and radar for Real-time Regional Model ROI. Select the model run corresponding to displayed region by clicking on the corresponding date at the bottom of the map.

Latest Floater (Primary) Region of Interest

Composite Reflectivity Precip Accumulation 1hr Precip

Latest Floater (Secondary) Region of Interest

Composite Reflectivity Precip Accumulation 1hr Precip

Latest for Colorado

Composite Reflectivity Precip Accumulation 1hr Precip

Real-time Regional Domain Index

The regional model domain is determined using an objective weighting method to select the region of interest. This method is currently using the 24 hour accumulated precipitation forecast from the 12km NAM (aka ETA) which is distributed operationally via NOAAPORT as the predictor for the region of interest (ROI) function. This function can be augmented to include other predictors of interest in the future. This field is shown in the upper left panel of the Regional Model Run index pages.

The center of the model domain is computed using GEMPAK's Gaussian Weighted Filter using normal distribution of weights (GWFS) for the 24 hour precipitation field (P24M) accumulated from F006 to F030. The weighted field is interpolated to CONUS station locations using GEMPAK's GDGSFC program. The model central latitude and longitude is obtained from the station location with the maximum weighted ROI value. This field is shown in the lower left panel of the Regional Model Run index pages. The central latitude/longitude for the model run is shown at the bottom of each page.

A floater radar composite image product for the inner nest of the model domain is generated from available 1km NIDS imagery at 5 minute intervals for the 30 hour time period of interest. This product is shown in the upper right panel of the Regional Model Run index pages, and selected frames may be animated by clicking on the image.

The Regional Model run uses 3 hour NAM grids from F000-F030 for the forecast domain Model output for the 5km forecast grid is generated hourly through 30 hours from the initial boundary run time. A display of selected forecast fields is shown in the lower right panel of the Regional Model Run index pages. Selected frames may be viewed/animated by clicking on the image.

Products for each model run are being inserted into the LDM for distribution. The naming convention for these products is evolving. The current set of products includes:

LDM Feed nameLDM product nameDescription
SPARE YYYYMMDDHH/eta_conus.gif 24 hour precipitation forecast for F006-F030 [GIF Image]
SPARE YYYYMMDDHH/eta_roi.gif Weighted Region of Interest prediction [GIF Image]
SPARE YYYYMMDDHH/model_center.dat Selected center latitude/longitude location for model run
SPARE rad/floater/YYYYMMDDHH/n0r_yyyymmdd_hhnn Floater radar composite image centered on model loaction for YYYYMMDDHH. yyyymmdd_hhnn denotes data time for product
SPARE YYMMDDHH_nmm.GrbFxxx GRIB format WRF/NMM output for regional forecast domain for F000-F030 model output.
SPARE YYMMDDHH.GrbFxxx Grid format WSETA output for inner nest domain for F000-F024 (based on T+06 - T+30 model output.
SPARE wseta.cdl CDL file for gribtonc decoding of GRIB data to NetCDF